Ultra-hard composite material and method for manufacturing the same

Abstract

An ultra-hard composite material and a method for manufacturing the same, including mixing a metal carbide powder and a multi-element high-entropy alloy powder to form a mixture, green compacting the mixture, and sintering the mixture to form the ultra-hard composite material. The described multi-element high-entropy alloy consists of five to eleven principal elements, with every principal element occupying a 5 to 35 molar percentage of the alloy.

1. A method for manufacturing an ultra-hard composite material, comprising:
 mixing a ceramic phase powder consisting of only one metal carbide and a multi-element high-entropy alloy powder to form a mixture; 
 green compacting the mixture; and 
 sintering the mixture to form an ultra-hard composite material, 
 wherein the multi-element high-entropy alloy powder consists of 5 to 11 elements, with every principal element occupying a 5 to 35 molar percentage of the multi-element high-entropy alloy powder. 
 
     
     
       2. The method as claimed in  claim 1 , wherein the step for forming the mixture comprises mechanical alloying. 
     
     
       3. The method as claimed in  claim 1 , wherein the step for sintering the mixture is processed in a vacuum chamber. 
     
     
       4. The method as claimed in  claim 1 , wherein the step for sintering the mixture is processed under a mixing gas of argon and hydrogen. 
     
     
       5. The method as claimed in  claim 1 , wherein the metal carbide comprises tungsten carbide or titanium carbide. 
     
     
       6. The method as claimed in  claim 1 , wherein the elements are selected from carbon group, aluminum group, chromium group, cobalt group, copper group, iron group, nickel group, vanadium group, or manganese group. 
     
     
       7. The method as claimed in  claim 1 , wherein the ceramic phase powder and the multi-element high-entropy alloy powder have a weight ratio of 95:5 to 60:40. 
     
     
       8. An ultra-hard composite material, comprising:
 (a) a ceramic phase powder consisting of only one metal carbide; and 
 (b) a multi-element high-entropy alloy powder, 
 wherein the multi-element high-entropy alloy powder consists of 5 to 11 elements, with every principal element occupying a 5 to 35 molar percentage of the multi-element high-entropy alloy powder. 
 
     
     
       9. The ultra-hard composite material as claimed in  claim 8 , wherein the metal carbide comprises tungsten carbide or titanium carbide. 
     
     
       10. The ultra-hard composite material as claimed in  claim 8 , wherein the elements are selected from carbon group, aluminum group, chromium group, cobalt group, copper group, iron group, nickel group, vanadium group, or manganese group. 
     
     
       11. The ultra-hard composite material as claimed in  claim 8 , wherein the ceramic phase powder and the multi-element high-entropy alloy powder have a weight ratio of 95:5 to 60:40. 
     
     
       12. The ultra-hard composite material as claimed in  claim 8 , wherein the ultra-hard composite material has a hardness of Hv 800 to Hv 2400.